I guess this is more or same as the O2 deals, it works the overall the total contract cost will be 439.99. Dolphin 10, only has 30 min, unlimited text and internet (not sure about limit), people on here going to argue about less minutes, which i will go further into.
here are the details:
Dolphin 10 tariff: 10 x 24 + 199 (Galaxy S2 phone costs) = 439.99
Not sure if there are any quichdo thing, but the 439.99 is non-cashback price.